{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4103-8HG42","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4103-8HG42","canonicalUrl":"https://aoctrl.com/siemens/5SJ4103-8HG42","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4103-8HG42","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker, 1-pole, D characteristic, 3 A rated, 70 mm depth, 18 mm width, IP20/IP40.","salesMarkdown":"Rated current holds at 3 A up to 40 °C ambient; above that it derates linearly to 2.6 A at 60 °C. This MCB is suited for mechanical engineering and industrial panel applications — motor branch circuits, small transformer primaries, and lighting contactor coils where the D-curve prevents nuisance tripping on inrush. The 60 V DC maximum rating also covers control-circuit protection in 24 VDC or 48 VDC loops.","metaTitle":"Siemens SENTRON 5SJ4103-8HG42 MCB, 1P, D-curve, 3 A","metaDescription":"Siemens SENTRON 5SJ4103-8HG42 miniature circuit breaker, 1-pole, D tripping characteristic, 3 A rated, 70 mm depth, active production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"18 mm","title":"5SJ4103-8HG42","Height":"121 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Circuit breaker 10kA, 1-pole, D, 3 A according to UL 489-277V","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"1","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors, IP 40 in the handle range","Overvoltage Category":"3","Tunnel Terminals Top":"No","Vibration Resistance":"50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","Combined Terminal Top":"Yes","Design Of The Product":"Miniature circuit-breaker 5SJ4","Product Function / Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","according to EN 61346-2":"F","at 30 °C / rated value":"3 A","at 40 °C / rated value":"3 A","at 45 °C / rated value":"2.9 A","at 50 °C / rated value":"2.8 A","at 55 °C / rated value":"2.7 A","at 60 °C / rated value":"2.6 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"1","Tripping Characteristic Class":"D","at DC / rated value / maximum":"60 V","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","Supply Voltage Frequency / Rated Value":"50 Hz","according to IEC 60947-2 / rated value":"15 kA","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","Type Of Voltage / Of The Operating Voltage":"AC/DC","insulation voltage (Ui) / at AC / rated value":"440 V","Product Component / Neutral Conductor Switching":"No","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10 – $104.27","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/965aef6b2e6c4ed5936fff471e14292c.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=123050&mlfb=5SJ4103-8HG42"},"ai":{"faq":[{"question":"What are the key ratings for this MCB?","answer":"1 pole, D tripping characteristic, rated 3 A at AC (derated at elevated temperatures), maximum DC voltage 60 V. Dimensions: 18 mm wide, 70 mm deep, 121 mm tall. Ambient temperature range -40 to 75 °C. IP20 with connected conductors, IP40 in the handle area."},{"question":"Will 5SJ4103-8HG42 drop into a panel specified around 5SL4363-7?","answer":"Both are 1-pole MCBs on a standard DIN rail, but the 5SJ4103-8HG42 is a D-curve 3 A device, while the 5SL4363-7 is a different characteristic and rating. The mechanical footprint (1 MW, 18 mm wide) is the same, so it fits the same rail space, but the trip curve and current rating must match the circuit design — verify coordination before substitution."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4103-8HG42","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/5SJ4103-8HG42 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}